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Carb Issue

#1 User is offline   Paul W Icon

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Posted 18 May 2011 - 02:10 PM

having a wee bit of a throttle/carb issue acts like its restricted, not allot of pedal throw, bit rough, and much stalling for the first 10 min, these quadrajets on the 1980 model worth rebuilding?
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#2 User is offline   Mark V Icon

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Posted 19 May 2011 - 05:19 AM

Folks love to blame the Quadrajets for all sorts of problems. Before messing with the carb, I would start checking for vacuum leaks. A common leak is the vacuum advance on the distributor. Check all other vacuum diaphragms like the choke pull-off, brake booster, smog system (especially that EGR valve), and all those diaphragms found in the air conditioning/heating system as well as all the vacuum hoses. If you're missing hoses or they're not connected then be sure to correct those conditions. There should be a hose diagram under the hood, otherwise, you'll need to refer to the shop manual. You'd be surprised how much trouble a simple vacuum leak can cause.

After that, check your ignition system; plugs, cap & rotor, timing, plug wires, distributor (you could have worn bearings). Next, confirm that your fuel delivery is up to snuff; fuel pump pressure and fuel filter condition.

If all those other systems are solid and you still think the carb need to be rebuilt then go ahead and do so. But use caution. The QJ is a complex carburetor but can be successfully rebuilt by an experienced rebuilder. You can do it yourself if you like and I can counsel you but if you want to have a rebuilder do it, be sure to do your homework.
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#3 User is offline   Paul W Icon

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Posted 19 May 2011 - 08:09 AM

View PostMark V, on 19 May 2011 - 06:19 AM, said:

Folks love to blame the Quadrajets for all sorts of problems. Before messing with the carb, I would start checking for vacuum leaks. A common leak is the vacuum advance on the distributor. Check all other vacuum diaphragms like the choke pull-off, brake booster, smog system (especially that EGR valve), and all those diaphragms found in the air conditioning/heating system as well as all the vacuum hoses. If you're missing hoses or they're not connected then be sure to correct those conditions. There should be a hose diagram under the hood, otherwise, you'll need to refer to the shop manual. You'd be surprised how much trouble a simple vacuum leak can cause.

After that, check your ignition system; plugs, cap & rotor, timing, plug wires, distributor (you could have worn bearings). Next, confirm that your fuel delivery is up to snuff; fuel pump pressure and fuel filter condition.

If all those other systems are solid and you still think the carb need to be rebuilt then go ahead and do so. But use caution. The QJ is a complex carburetor but can be successfully rebuilt by an experienced rebuilder. You can do it yourself if you like and I can counsel you but if you want to have a rebuilder do it, be sure to do your homework.
true I was a wrench for 25 years, and rebuilding one is not a problem, never been a Quadrajet fan, I believed they were conceived by an evil dwarf, like the one who designed the plastic carb on Chrysler products in the 80's. I have not found a air leak yet, but will give it a good go over this week. It did However, pass smog in January which was 97 miles ago.. then again I am used to my daily driver, kind of forgot about the quirkiness of older vehicles.. But I will let you know what I find.. Mark in your opinion what would be a suitable replacement? Of course I know a manifold swap would be needed, would like an F.I. unit, but??
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#4 User is offline   Mark V Icon

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Posted 20 May 2011 - 05:48 AM

Tell you what, I wrote an article about rebuilding the QJ I can email to you for you to review which may help you.
As for a replacement, I know that Holly and Edelbrock both made Spreadbore pattern carbs that were meant to be direct replacements for QJ's so you wouldn't need to replace the manifold but you may need to mess with the throttle and choke linkages which is a pain as well. I simply don't remember the model numbers.
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#5 User is offline   Paul W Icon

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Posted 20 May 2011 - 07:55 AM

View PostMark V, on 20 May 2011 - 06:48 AM, said:

Tell you what, I wrote an article about rebuilding the QJ I can email to you for you to review which may help you.
As for a replacement, I know that Holly and Edelbrock both made Spreadbore pattern carbs that were meant to be direct replacements for QJ's so you wouldn't need to replace the manifold but you may need to mess with the throttle and choke linkages which is a pain as well. I simply don't remember the model numbers.
Thank you and great full, My throttle is a pain, short short throw, cant hit it for say passing, but then again its not a hot rod.. I will check it out and thank you again.
Paul
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